leta huntsinger | pb | 919-468-2156 | huntsinger@pbworld.comhuntsinger@pbworld.com stacey bricka |...
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Leta Huntsinger | PB | 919-468-2156 | huntsinger@pbworld.com
Stacey Bricka | NuStats | 512-306-9065 | sbricka@nustats.com
Session 7
Capturing Special Population Groups through Targeted Sampling
11th National Transportation Planning Applications ConferenceMay 6-10, 2007, Daytona Beach, Florida
Introduction and Overview
Wake County
Nash County
Johnston County
Harnett County
Chatham County
Lee County
Franklin County
Granville County
Person County
Orange County
Vance County
Durham County
2005_trm_surveyboundary_outer2005_trm_surveyboundary_innerCounty Boundary
0 50 Miles
N
EW
S
Special Populations
Transit-using At least one trip by transit on travel day
Low-income Households falling below the 2005 poverty line Census definition using size and income
Non-motorized Walk or bike to work or school on travel day
Students Report at least one trip to a university campus on
travel day
Why Special Populations
Regional Goals “Develop a regional transportation network that
improves quality of life and the environment” “Convenient, accessible, and affordable public
transportation system…” “A pedestrian and bicycle system that: provides
an alternative means of transportation; allows greater access to public transit…”
“A transportation plan that is integrated with local land use plans and development policies.”
“A multi-modal transportation system which provides access and mobility to all residents, while protecting the natural environment, cultural resources, and social systems.”
Why Special Populations
Regional Profile
Approach to Capture Populations
US Census Data used to ID tracts Journey to Work Data: Transit-using and Non-
motorized Population Data: Low-income SF4 Table PCT63: Students
List of tracts fitting profile developed Tracts with highest likelihood identified Sample generated using listed records only
Approach
Approach
Distribution by Geography
Was the Targeted Sample Needed?
Student CrossTab
64%8%
7%
9%
12% 0% Random
Non-Mot
Low -Inc
Student
Transit
Other
Was the Targeted Sample Needed?
NonMot CrossTab
52%
14%
3%
11%
20%0% Random
Non-Mot
Low -Inc
Student
Transit
Other
Was the Targeted Sample Needed?
Transit CrossTab
42%
13%6%
10%
28%
1% Random
Non-Mot
Low -Inc
Student
Transit
Other
Was the Targeted Sample Needed?
Low Inc CrossTab
64%
7%1%
8%
14%
6%
Random
Non-Mot
Low -Inc
Student
Transit
Other
Bottom Line
The number of samples was ok, but not high enough without the targeted sample.
Travel Characteristics
Demographic and Household Characteristics
HH Size
0%10%20%30%40%50%
1 2 3 4+
NonMot No NonMot Total
HH Size
0%10%20%30%40%50%
1 2 3 4+
Student NonStudent Total
HH Size
0%10%20%30%40%50%
1 2 3 4+
Transit No Transit Total
HH Size
0%
20%
40%
60%
1 2 3 4+
LowInc Non LowInc Total
Demographic and Household Characteristics
HH Veh
0%
20%
40%
60%
0 1 2 3+
Student Non Student Total
HH Veh
0%
20%
40%
60%
0 1 2 3+
NonMot No NonMot Total
HH Veh
0%10%20%30%40%50%
0 1 2 3+
Transit No Transit Total
HH Veh
0%
20%
40%
60%
0 1 2 3+
LowInc Non LowInc Total
Travel Characteristics
Average Total Trip Length
18.65 19.94
14.9217.69
21.03
0
5
10
15
20
25
Total Students NonMot Transit LowInc
Average Total Trip Rate
9.7011.37
13.13
11.03
6.74
0.002.004.006.008.00
10.0012.0014.00
Total Students NonMot Transit LowInc
Travel Characteristics
Average Trip Rates
0.00
2.00
4.00
6.00
Total 1.32 0.21 0.99 0.68 0.08 3.13 3.28
Student 1.29 0.18 0.83 0.65 1.49 3.01 3.92
NonMot 1.71 0.20 0.81 0.92 0.21 3.58 5.71
Transit 0.80 0.16 0.69 0.68 0.19 3.59 4.93
LowInc 0.66 0.11 0.95 0.60 0.17 2.33 1.92
HBW HBWR HBSH HBSC HBU HBO NHB
Choice Characteristics
Mode
0%20%40%60%80%
Driver Passenger Transit Non-Motorized
Other
Student Non Student Total
Mode
0%20%40%60%80%
Driver Passenger Transit Non-Motorized
Other
NonMot No NonMot Total
Mode
0%20%40%60%80%
Driver Passenger Transit Non-Motorized
Other
Transit No Transit Total
Mode
0%20%40%60%80%
Driver Passenger Transit Non-Motorized
Other
LowInc Non LowInc Total
Choice Characteristics
Factors Considered in Moving
0%5%
10%15%20%25%30%35%
Student
Non Student
Total
Factors Considered in Moving
0%5%
10%15%20%25%30%35%40%
NonMot
No MonMot
Total
Factors Considered in Moving
0%5%
10%15%20%25%30%
Transit
No Transit
Total
Factors Considered in Moving
0%5%
10%15%20%25%30%35%40%
LowInc
Non LowInc
Total
Findings and Recommendations
Target Sample is Recommended Target sample easy to develop and apply Needed the targeted sample to meet sample
goals Travel Characteristics are Different
Trip rates vary by population group Trip lengths are different Factors affecting mode choice vary
Useful data Model development Sketch planning applications Policy issues
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